Layer: PM2.5 Chemical Speciation Network - Active (ID: 18)

Description: This web service layer displays air monitoring locations that measure particulate matter of 2.5um or less (PM2.5) in the Chemical Speciation Network in the US.

Definition Expression: N/A

Copyright Text: Map Service: US EPA Office of Air and Radiation, Office of Air Quality Planning and Standards (OAR, OAQPS). Data: Various state, local, and tribal air pollution agencies using procedues specified by the US EPA.